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Opal

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MMM32419

Opal

Description Tabs

Description
Locality: 
Gunheath Pit, St Austell, Cornwall, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 9 × 8 cm
Description

A large piece of granite matrix covered on two sides with translucent opal.

Mineral Data
What's on the rock

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Streak: 
White